Ball Screw or Timing Belt Linear Actuator? Start with Speed, Repeatability, Travel and Load

Published:2026-08-16 09:00:00

Ball screw vs timing belt actuator

There is no universal winner—only a better match for the stroke and cycle

Timing belts usually make high speed and long travel easier, while ball screws generally favor repeatability and axial drive stiffness. Load must still be divided into drive thrust, guide capacity and carriage moments.

High speed and long travel often start with a belt comparisonRepeatability and stiffness often start with a ball screwLoad capacity includes the guides and base

HZMotion ball screw and timing belt linear actuators — Real HZMotion product renders are used. Internal configuration and ratings follow the selected series data.

01 / Four first filters

Start with the motion task, then choose the drive

Criterion	Ball screw actuator	Timing belt actuator	Also verify
Speed and acceleration	Depends on lead, screw rpm, critical speed and DN limit	Often suitable for higher linear speed and long transfer	Motor speed, ratio, payload and full profile
Repeatability	Generally favors small repeatability error and axial stiffness	Affected by belt compliance, pretension, pulleys and load change	Do not confuse repeatability with absolute accuracy
Travel	Long stroke needs screw diameter, span and critical-speed checks	Usually easier to extend to long travel	Base joints, belt vibration, cabling and covers
Drive thrust	Often used for higher process force and stiffness	Limited by belt width, tooth profile, engagement and tension	Guide Fy/Fz and carriage Mx/My/Mz
Environment	Lubrication, contamination, critical speed and heat	Tension, tooth condition, pulley alignment and belt aging	Dust, chips, liquid, temperature and access

Catalog trends are not laws: screw supports, larger leads and special designs extend the screw boundary, while external feedback can change belt-axis positioning. Decide from the exact series and duty.

02 / Same-platform comparison

A common structure exposes the drive tradeoff

HZMotion ball screw linear actuators — Check lead, rpm, thrust, repeatability and support conditions.

HZMotion timing belt linear actuators — Check tension, pulleys, acceleration, long-stroke vibration and orientation.

HZMotion platform	Drive	Repeatability example	Speed example	Travel example
TKA	Ball screw	C grade ±0.01 mm; P grade ±0.005 mm	1.5 m/s	2000 mm
TKB	Timing belt	±0.1 mm	2 m/s	3700 mm
TKS / TKS-B	Screw / belt	The same repeatability-speed-travel tradeoff	By size and configuration	By size and configuration

Data boundary: these are family-level examples. One model does not necessarily achieve all maxima simultaneously; verify size, stroke, lead/ratio, orientation and load.

03 / Break down load

“How many kilograms?” is not a complete requirement

Axial drive force

Covers acceleration, steady motion, process force and vertical gravity.

Guide capacity

Moving mass and external force act on the guides; verify Fy, Fz and life.

Carriage moments

Overhang and center-of-mass height create Mx, My and Mz, often before static mass becomes limiting.

Ball screw focus

Check acceleration force, duty load, screw life, lead, critical speed, support arrangement, nut and fixed-end bearing.

Timing belt focus

Check effective tension, tooth engagement, pretension, pulley bearings, belt stretch and reciprocating rate.

04 / Six-step selection

Put speed, accuracy, travel and load into one duty sheet

Define the profileStroke, cycle time, maximum speed, acceleration time, dwell and cycles per minute.
Define positioningSeparate repeatability, absolute accuracy, minimum increment, settling and load-dependent error.
Break down the loadMoving mass, process force, orientation, center of mass, overhang and Mx/My/Mz.
Verify the driveFor screws: critical speed, DN, lead and axial life. For belts: tension, engagement, stretch and pulleys.
Verify guides and baseStatic/dynamic capacity, life, rigidity, mounting surface and multi-axis arrangement.
Size the motor lastSpeed, peak and RMS torque, inertia, regeneration and mechanical interface.

05 / Common mistakes

Four catalog maxima cannot be combined at will

Belts cannot position precisely

False as an absolute statement; structure, pretension, feedback, control and load all matter.

Screws always carry more load

Drive thrust, guide load and carriage moment are different limits.

Long stroke always means belt

Accuracy, process force, speed and supported-screw options still matter.

Maximum speed is working speed

A short stroke may never reach it; the full acceleration profile determines cycle time.

Only no-load repeatability matters

Payload, moments, heat, belt compliance and mounting datums change system results.

06 / Quick answers

Screw and belt actuator questions

Does high speed automatically mean a timing belt?

No. Stroke, repeatability, process force and environment still matter. A correctly supported, larger-lead screw can be fast within critical-speed and DN limits.

Can a belt actuator be mounted vertically?

Only if the selected family and configuration permit it. A separate falling-load, brake, belt-load and safety assessment is still required.

Why can guide load be similar while drive type differs?

The guides and base carry much of the external load. The drive mainly changes force transmission, speed, travel, stiffness and transmission error.